Iván Böszörményi-Nagy (born Budapest, May 19, 1920; died Glenside, Pennsylvania, January 28, 2007) was a Hungarian-American psychiatrist and one of the founders of the field of family therapy. He emigrated from Hungary to the United States in 1950.

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Böszörményi-Nagy developed the Contextual approach to family therapy and individual psychotherapy. It is a comprehensive model which integrates individual psychological, interpersonal, existential, systemic, and intergenerational dimensions of individual and family life and development.